| LC control no. | n 83049026 |
|---|---|
| Geographic heading | Piedras Negras (Mexico) |
| Geographic subdivision usage | Mexico--Piedras Negras |
| Variant(s) | Piedras Negras, Mexico |
| See also | Ciudad Porfirio Díaz (Coahuila, Mexico) |
| Biography/History note | 28°42ʹN - 100°31ʹW |
| Found in | Bookmap Corporation. Eagle Pass, Texas, c1974. Col. Lipp. gaz., 1962 (Piedras Negras f. 1849; renamed Ciudad Porfirio Díaz for the dictator in 1888; with his downfall, former name restored) |
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